Cast
Margaret O'Brien
Alpha
James Craig
Mike Regan
Keenan Wynn
Packy Roost
Sara Haden
Rhoda Kitterick
Howard Freeman
Professor Richards
Robert Blake
Jerry
Ava Gardner
Hat Check Girl (uncredited)
Hooper Atchley
Pepi (uncredited)
Marsha Hunt
Katie Mallory
Philip Merivale
Professor Peter Vincent
Alan Napier
Dr. Woodring
Kathleen Lockhart
Mrs. Catty
Barbara Bedford
Telephone Operator (uncredited)
Mike Mazurki
Fighter (uncredited)
Eddie Acuff
Policeman (uncredited)
Victor Sen Yung
Chinese Man (uncredited)
Elisabeth Risdon
Mrs. Pringle
Pauline Starke
Bobby's Mother (uncredited)
William Bishop
Reporter (uncredited)
Naomi Childers
Matron (uncredited)
Henry O'Neill
Professor Josh Pringle
Donald Meek
Professor Catty
Walter Fenner
Professor Endicott